The main goal of the present study was to evaluate the phenological development of pepper genotypes with different origin depending on environmental factors under the Bulgarian conditions with a view to proposing the most suitable ones for inclusion in the breading programs. The experiments were carried out in 2015-2017 years under the South Bulgarian conditions, in Agricultural University-Plovdiv region, with seventh different pepper genotype and breeding lines. The plants were grown by the conventional for middle yearly field production technology. The phenophases of beginning and mass: sprouting, flower bud, flowering, fruit set and fruiting were recorded. Four harvests were done and productivity was determined. The average daily temperature, total active temperature sum, maximal and minimal temperature, rainfall and the hydrothermal coefficient of vegetation period were calculated. Between phenological behaviors on one hand and productivity on the other hand and elements of climatic conditions, high relations were determinated. High regression coefficients between average daily temperature, total active temperature sum and rainfall and periods between different stage of development and productivity were established. The highest productivity and earlier occurrence of some phenophases of 42-2013 and 42-2010 makes them most suitable to be proposed for inclusion in future breeding programs.